*) Simplify the second expression 2(2m + 2) + m. 2(2m + 2) + m = m + ?
2 answers:
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You can either use the usual formula for the equation of a line when given two points
Or we can make some more precise reasoning, specific to this case: the y intercept is 3. When a line is written as , the coefficient q is the y intercept. So, the second and third options are surely wrong.
Moreover, the slope m is the ratio between the difference bewteen the y coordinates and the x coordinates of two points on the line.
In our case, the two points differ by -1 units vertically, and 3 units horizontally. This implies that the slope is -1/3.
So, we have
